Research: Tall Ships
Tall Ships are large, traditionally rigged sailing vessels. What you think of when you think of pirate ships. They weren't always called tall ships.
At one point, vessels with three or more masts were ships and vessels with less than 3 masts were boats3. No one really cares about that now though!
Brigs
A sailing vessel with two square-rigged masts. The aft (rear) mast is the main mast. Brigs were used for both mercantile and naval purposes. Merchant vessesls mainly wet along coastal trading routes, but oceanic voyages weren't uncommon.
Brigs require 7-16 crew and the ships were 75-165ft long4
images from the wikipedia article for Brigs
The East is a brig around 120ft long with a crew of ~10 people (including unnamed characters not listed in the character list)